Time-Resolved Measurements of Photocarrier Dynamics in TiS₃ Nanoribbons

We report synthesis and time-resolved transient absorption measurements of TiS₃ nanoribbons. TiS₃ nanoribbons were fabricated by direct reaction of titanium and sulfur. Dynamics of the photocarriers in these samples were studied by transient absorption measurements. It was found that following ultrafast injection of nonequilibrium and hot photocarriers, the thermalization, energy relaxation, and exciton formation all occur on a subpicosecond time scale. Several key parameters describing the dynamical properties of photocarriers, including their recombination lifetime, diffusion coefficient, mobility, and diffusion length, were deduced.